#include <iostream>
class bad_hmean
{
private:
	double v1;
	double v2;
public:
	bad_hmean(double a = 0.0, double b = 0.0) : v1(a), v2(b) {}
	void mesg();
};

inline void bad_hmean::mesg()
{
	std::cout << "hmean(" << v1 << " , " << v2 << ") : " << "invalid arguments: a = -b\n";
}

class bad_gmean
{
public:
	double v1;
	double v2;
	bad_gmean(double a = 0.0, double b = 0.0) :v1(a), v2(b) {}
	const char *mesg();
};

inline const char *bad_gmean::mesg()
{
	return "gmean() arguments should be >= 0 \n";
}
